Geography • World GeographyMedium
The 'Laurentian Plateau' (Canadian Shield) is predominantly composed of which type of ancient geological rocks?
A. Young sedimentary limestone
B. Precambrian igneous and high-grade metamorphic rocks✓ Correct Answer
C. Cenozoic basaltic lava flows
D. Recent alluvial deposits
💡 Solution & Explanation
The Canadian Shield is an extensive continental geological shield composed primarily of ancient Precambrian igneous and high-grade metamorphic rocks dating back billions of years. Other options incorrectly identify the bedrock as young sedimentary strata or recent alluvial deposits formed by river systems. This craton forms the stable geological foundation of the North American landmass.
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